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copied!<p>Don't throw away your code!</p> <p>It's the single worst mistake you can make (on a large codebase). See <a href="http://www.joelonsoftware.com/articles/fog0000000069.html" rel="nofollow noreferrer">Things You Should Never Do, Part 1</a>.</p> <p>You've invested a lot of effort into that old code and worked out many bugs. Throwing it away is a classic developer mistake (and one I've done many times). It makes you feel "better", like a spring cleaning. But you don't need to buy a new apartment and all new furniture to outfit your house. You can work on one room at a time... and maybe some things just need a new paintjob. Hence, this is where refactoring comes in.</p> <p>For new functionality in your app, <a href="http://blog.danbartels.com/articles/322.aspx" rel="nofollow noreferrer">write it in C# and call it from your classic ASP</a>. You'll be forced to be modular when you rewrite this new code. When you have time, refactor parts of your old code into C# as well, and work out the bugs as you go. Eventually, you'll have replaced your app with all new code.</p> <p>You could also write your own compiler. We wrote one for our classic ASP app a long time ago to allow us to output PHP. It's called <a href="http://www.joelonsoftware.com/items/2006/09/01b.html" rel="nofollow noreferrer">Wasabi</a> and I think it's the reason Jeff Atwood thought Joel Spolsky went off his rocker. Actually, maybe we should just ship it, and then you could use that. </p> <p>It allowed us to switch our entire codebase to .NET for the next release while only rewriting a very small portion of our source. It also caused a bunch of people to call us crazy, but writing a compiler is not that complicated, and it gave us a lot of flexibility.</p> <p>Also, if this is an internal only app, just leave it. Don't rewrite it - you are the only customer and if the requirement is you need to run it as classic asp, you can meet that requirement.</p>

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